Personally I wouldn't bother with USB3 compatibility at the moment. It's early days at the moment and not all of the interface standards have been worked out yet. If you want to go that way in the future you'll likely be able to get a USB3 PCI card.
I've just done a very brief check on the M2N32 mobo you've suggested and it looks like it won't take you graphics card or RAM....or processor.
I don't think you'll find a board that will take the rest of your hardware and has wireless built in - it's too old for that. Will post back a suggestion on what to get later. Got some work type stuff to do now!